Malicious PDF — malware analysis report

Static analysis result for SHA-256 116b735b84b03b99…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 04:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1a76f439fbb7ef4c5e44cdf4c61ac64 SHA-1: 7d87a8c2bf90df1522e2c59459105366c47ef747 SHA-256: 116b735b84b03b992a763bbf5b461384633b15b69409e8e2ae3c749782787522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. These URLs are likely intended to lure users into clicking them, potentially leading to further compromise. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbacd26be---diwegegowejereduxexowu.pdf
    • http://waycreon.net/bhaskar/yii/upload/files/wafitu.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5be8aa68c---76475560779.pdf
    • http://l-max.ru/userfiles/file/75630788780.pdf
    • http://kapelski.pl/userfiles/file/86976418920.pdf
    • https://eijo.in/ckfinder/userfiles/files/54769053536.pdf
    • http://siamintertrade.com/file_media/file_image/file/95850294617.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161387103ec8c3---vibukowudidagusekutuvoz.pdf
    • http://elturo.ru/img/upload/files/dadelesakokoguxibal.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/2509905385.pdf
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/68216906363.pdf
    • https://curvy.tw/upload/files/febugek.pdf
    • https://hanomanberjaya.com/contents/files/16159564283.pdf
    • http://sun-apartments.pl/data/pages/talexipuxutuderowokevumaj.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/wujemowajajerigufepijigo.pdf
    • http://spalovnachemolak.sk/userfiles/file/32194203080.pdf
    • http://ntvietnga.com/upload/files/64780639439.pdf
    • https://detmers-kontejner.hr/files/78681880453.pdf
    • http://skulpt.in/admin/uploads/file/9019218539.pdf
    • http://geometramaurotozzi.it/userfiles/files/96279214413.pdf
    • https://warungmimpishio.com/contents/files/10456549086.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107d12de4a---23770144280.pdf
    • http://qzgj.cn/upload/file/pafoxuvizodewumemurumud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bbk+launcher+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8b.bin
089cccdcfbed3ec9296e9c3b5f5c8dcdc381e8cf9d002cd5c498812c7916f51d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 20724 bytes
font_01_sfnt_off000123dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 16792 bytes
font_02_sfnt_off00013bf4.bin
0b00aa79f7cee3164f4e6df611fee74a3451b478a25fe9ef8a4d6781d5f5b47d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF4 10676 bytes